Galván-Antonio, .A., Sánchez-Hernández, .M., Calderón-Sánchez , F. y Guerrero-Rodríguez , J. de D. 2021. Characterization of subsistence sheep farming: The case of three communities of the municipality of Tlahuapan, Puebla, Mexico. Agro Productividad. 13, 12 (ene. 2021). DOI:https://doi.org/10.32854/agrop.v13i12.1899.